feat: rewrite ce:plan to separate planning from implementation
Restructures ce:plan around a decisions-first philosophy: - Replace issue-template output with durable implementation plans - Add blocker classification gate for upstream requirements (R11-R13) - Replace MINIMAL/MORE/A LOT with Lightweight/Standard/Deep - Add planning bootstrap fallback with ce:brainstorm recommendation - Remove all implementation code, shell commands, and executor litter - Make SpecFlow conditional for Standard/Deep plans - Keep research agents, brainstorm-origin integration, and handoff options - Restore origin doc completeness checks, user signal gathering, research decision examples, filename examples, stakeholder awareness, and mermaid diagram nudges from the old skill
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